I really think it depends on your use-case. The surface area of HTTP is huge. I'd like to think it's production ready, but I'm only just beginning to dog-food Falcon in production on my end.

Pragmatically speaking, it will be production ready when it reaches 1.0 - until then, make sure you test it well and keep an eye on how it behaves. I've literally run millions of requests against test servers, but... it's pretty wild out there!